The Scrum of Scrums is often saw as something ‘which grew out of control’, ‘just for Scrum Masters’ or something suited just to very large organizations.
It isn’t, actually…and it’s not rocket science, either.
A Scrum of Scrums is the best possible way of clearing doubts and questions raised among teams. It must not be merged or confused with a bigger standup meeting (as I’ve heard it…) because it is something brought on by the teams’ representatives – the Scrum Masters.
Its scope is to get a clear understanding of the problem’s domain and provide a solution – as the Scrum Master is there to remove impediments.
And yes: a Scrum of Scrums can have its own backlog, Jeff Sutherland defines the Scrum of Scrums as “…an operational delivery mechanism”, so having a backlog is perfectly reasonable.